Even the basic 3-part AN nutes has a lot more going for it than GH and they promote pot growers not deny their nutes are used to grow pot like GH. If you want to support a hypocritical company with your money then buy GH but I'd rather support a company that has fought tooth and nail to develop some of the best nutes for growing pot and isn't afraid to announce it publicly like they have since their inception. Now that GH is owned my Scott's/Monsanto anyone who buys any of their products drops to the bottom of the list of people I consider cannabis educated.
With AN in every bottle of nutes they add Wet Betty, a surfactant that helps the nutes be absorbed into the roots. Fulvic acid and lots of aminos are also in there plus the micros are ALL chelated and then theirs the pH Perfect technology that makes sure the nutes are available to the plants in a very wide range of conditions.
With GH you get salts, mostly sourced from the cheapest bidder in China and pretty shitty quality control so the new bottles you get could be different concentrations than the last batch which throws off your feeding from one cycle to the next. In that case I'd totally agree that you are better off buying the base salts and mixing up your own nutes like I used to back in '82 the first time I tried hydro nutes.
I went into downtown Vancouver to Western Water Farms and bought a 1000W MH ballast and bulb and a kit of all the salts in bags with a small bag of the micro-nutrients. I also got a photocopy of formulas to mix them at for various vegetables where I was told to use the tomato recipe for my "special tomatoes" as a store could get shut down if it became known they sold to pot growers. I don't want to do all that fussing around again and I have a diploma in chemistry so it's not like it's hard to figure out for me but it's harder than using a few bottles of pre-mixed nutes designed just for growing cannabis and not made for general vegetable/flower growing like GH soon to be sold in quality stores like Walmart!
For the amount I grow the nutes I have now will last at least 2 years. Were I to go much bigger then I'd for sure buy 50lb bags of base salts and mix my own for pennies on the dollar compared to even crappy GH nutes. Mine would likely be better as well.
And like I posted above the 3gals of AN was $20 cheaper than 3gals of GH. Even if it was the other way around I would have got the AN. It's the supplements they suck you in with if you're the kind of person that has to have it all even if you don't know what to do with it other than to read the label and dump it in. Do that with the full line and I guarantee you end up with dead plants.
To each their own tho.